US5710818A - Apparatus for expanding and controlling sound fields - Google Patents

Apparatus for expanding and controlling sound fields Download PDF

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Publication number
US5710818A
US5710818A US08/188,738 US18873894A US5710818A US 5710818 A US5710818 A US 5710818A US 18873894 A US18873894 A US 18873894A US 5710818 A US5710818 A US 5710818A
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United States
Prior art keywords
signals
sound
crosstalk
adjustment
signal
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US08/188,738
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English (en)
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Toshitaka Yamato
Hiroshi Kowaki
Kazuya Sako
Hiroyuki Yamaguchi
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Denso Ten Ltd
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Denso Ten Ltd
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Priority claimed from JP11581490U external-priority patent/JPH0472800U/ja
Priority claimed from JP11581390U external-priority patent/JPH0472799U/ja
Priority claimed from JP2305707A external-priority patent/JPH0834653B2/ja
Application filed by Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to US08/188,738 priority Critical patent/US5710818A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form

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  • the present invention relates to an apparatus for expanding and controlling sound fields designed to correct the asymmetry of sound fields that will occur as in an automotive vehicle compartment when stereophonic signals are reproduced by loudspeakers disposed laterally asymmetrically with respect to a listening position, and to expand the sound fields for stereo-sound reproduction having a full presence.
  • FIG. 1(1) is a plan view for explaining asymmetric sound fields formed with in a vehicle compartment 51.
  • a right-channel loudspeaker sr is disposed at a front right position of driver's seat 52, while a left-channel loudspeaker sl is disposed at a front left position of a passenger's seat 53 in the vehicle compartment 51 as shown in FIG. 1(1).
  • These loudspeakers sl, sr are built in, for example, an instrument panel 54.
  • acoustic signals from an acoustic signal source are fed to the loudspeakers sl, sr with only right- and left-side balance thereof, i.e., level adjustment.
  • the localization position of virtual sound source that should primarily be localized in the frontward direction of the driver 55 indicated by reference character l51 becomes biased toward the loudspeaker sr as indicated by reference character 57.
  • the acoustic energy distribution cannot be balanced between the right side and the left side, and therefore the angle of lateral divergence or bias of the sound fields cannot be corrected.
  • a center loudspeaker sc is disposed between loudspeakers sl, sr of left- and right-channels in an instrument panel 54.
  • signals obtained by adding the acoustic signals of left- and right-channels are converted into acoustic vibrations.
  • a sound field is formed by the right-channel loudspeaker sr and center loudspeaker sc at a right side seat 52 when viewed in the forward direction of vehicle compartment 51.
  • a sound field is formed by the left-channel loudspeaker sl and center loudspeaker sc at a left side seat 53.
  • the right-channel loudspeaker sr is disposed at an angle ⁇ 51 with respect to the frontward direction indicated by reference character l51, whereas the center loudspeaker sc is disposed at an angle ⁇ 52 with respect to the frontward direction l51, the angle ⁇ 52 being wider than the angle ⁇ 51. Therefore, the sound which the driver 55 listens to involves same deviation in phase as described above according to the difference in distance between the listening position of the driver 55 and the respective loudspeakers sr, sc.
  • the compartment 51 is a limited acoustic space. Because of the limitation as to the mounting positions of the loudspeakers sl, sr, the angle of divergence shown by reference character ⁇ 51 is smaller than 30 degrees which can form an ideal sound field. More specifically, focusing on the position of the driver 55, the direction of the source of the right-channel sound cannot be localized outwardly of the loudspeaker sr disposed at a comparatively narrow angle of divergence. This results in a very narrow sound field, which provides no satisfactory sensation of presence.
  • the prior art stereo-sound reproducing apparatuses are so constructed that the respective adjusted amounts are changed individually to obtain an angle of divergence the listener will desire, necessitating a very cumbersome operation. Therefore, with particularly the automotive stereo-sound reproducing apparatuses, this cumbersome operation interferes with the driving operation.
  • an apparatus for expanding and controlling sound fields comprising:
  • an acoustic signal source for outputting acoustic signals of left- and right-channels
  • left- and right-channel loudspeakers used for stereo-sound reproduction are disposed as in an automotive vehicle compartment, at angularly different positions from each other with respect to a frontward direction of a listening position.
  • acoustic signals of left- and right-channels are outputted. These acoustic signals are inputted to the crosstalk signal generating means and the crosstalk adjustment signal generating means.
  • the crosstalk signal generating means corrects at least one of the phase and the level of the acoustic signals of left- and right-channels inputted thereto so as to generate the crosstalk signals of the respective right- and left-channels. Also, the crosstalk adjustment signal generating means corrects the level of the acoustic signals of left- and right-channels inputted thereto so as to generate cross-talk adjustment signals of the respective right- and left-channels.
  • the corresponding crosstalk signals, crosstalk adjustment signals, and acoustic signals from the acoustic signal source are respectively added in the adding means, and outputted to the loudspeakers of the corresponding channels.
  • a laterally symmetric sound field can be formed in which a sound image is localized in a frontward direction of the listening position by adjusting the phase and the level correction amounts of the acoustic signals in the crosstalk signal generating means. Further, an angle of divergence of the sound field can be easily changed by adjusting the level correction amounts of the acoustic signals in the crosstalk adjustment signal generating means.
  • a sound field for effective sounds relative to the fundamental sounds can have its lateral asymmetry corrected, and be expanded and controlled in a manner similar to the above, by treating the acoustic signals from the acoustic signal source as those of fundamental sounds.
  • the crosstalk signal generating means and the crosstalk adjustment signal generating means for the effective sounds are additionally provided, and outputs of the corresponding channels from the respective generating means are released as sounds from a common loudspeaker after being added.
  • an apparatus for expanding and controlling sound fields comprising:
  • an acoustic signal source for outputting acoustic signals of left- and right-channels to corresponding left- and right-channel loudspeakers
  • the acoustic signals of left- and right-channels from the acoustic signal source are outputted to the corresponding left- and right-channel loudspeakers, and also to the crosstalk signal generating means and the crosstalk adjustment signal generating means.
  • the crosstalk signal generating means corrects at least one of the phase and the level of the acoustic signals inputted thereto so as to generate the crosstalk signal. Further, the crosstalk adjustment signal generating means corrects the level of the acoustic signals inputted thereto so as to generate the crosstalk adjustment signal.
  • the crosstalk signal and the crosstalk adjustment signal are added in the adding means, and outputted to the center-channel loudspeaker disposed between the left- and right-channel loudspeakers.
  • laterally symmetric sound fields can be formed which the respective sound images are localized in the frontward direction of left and right listening positions.
  • an ankle of divergence of the sound field can be easily adjusted.
  • acoustic signals of effective sounds are generated on the basis of the acoustic signals from the acoustic signal source, and released from the respective left- and right-channel loudspeakers in a manner similar to the above.
  • the crosstalk signal and the crosstalk adjustment signal may be generated from the acoustic signals of effective sounds, and be outputted from the center-channel loudspeaker.
  • FIG. 1(1) is a plan view for explaining the prior art
  • FIG. 1(2) graphically shows an acoustic energy distribution on the hearing sense of a driver 55;
  • FIG. 2 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 1 according to the invention
  • FIG. 3 is a functional block diagram for explaining signal processing operations of a signal processing unit 14;
  • FIG. 4 is a functional block diagram for explaining in detail a crosstalk generating unit C1;
  • FIGS. 5(1) to 5(4) are plan views for explaining functions of sound image control units U1 to U3 respectively;
  • FIG. 6 is a plan view showing a widening effect of sound fields according to the invention.
  • FIG. 7 is a functional block diagram for explaining a signal processing unit 14a of another embodiment of the invention.
  • FIG. 8 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 1b representing still another embodiment of the invention.
  • FIG. 9 is a functional block diagram for explaining signal processing operations in a signal processing unit 14b;
  • FIG. 10 is a functional block diagram for explaining in detail a crosstalk generating unit C1b;
  • FIGS. 11(1) to 11(4) are plan views for explaining functions of sound image control units U1b to U3b respectively;
  • FIG. 12 is a plan view showing a widening effect of sound fields according to still another embodiment of the invention.
  • FIG. 13 is a functional block diagram for explaining a signal processing unit 14c of another embodiment of the invention.
  • FIG. 14 is a block diagram shoving an electric construction of an automotive acoustic reproducing apparatus 10 representing still another embodiment according to the invention.
  • FIG. 15 is a functional block diagram for explaining a signal processing unit 15;
  • FIG. 16 is a graph showing acoustic spectra of fundamental sounds and effective sounds.
  • FIG. 17 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 10b representing still another embodiment according to the invention.
  • FIG. 2 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 1 as an embodiment of the invention.
  • loudspeakers SL, SR are mounted on an instrument panel 5 disposed in front of a driver's seat 3 and a passenger's seat 4. More specifically, the loudspeaker SL is disposed on the left side while the loudspeaker SR is disposed on the right side with respect to a frontward direction from the driver's seat 3 and the assistant's seat 4.
  • An acoustic signal of left-channel is outputted to a line 12 while an acoustic signal of right-channel is outputted to a line 13 from an acoustic signal source 11, such as a magnetic tape reproducing apparatus, and a radio receiver.
  • the acoustic signals of left- and right-channels are converted into digital acoustic signals respectively by analog/digital converters ADDL, ADDR, and then inputted to a signal processing unit 14.
  • the signal processing unit 14 may be a so-called digital signal processor or the like.
  • a memory 14M is provided for the signal processing unit 14.
  • a control unit 18 is provided or controlling an arithmetic processing of the signal processing unit 14 in response to inputs from an input unit 17.
  • the signal processing unit 14 carries out, for examples, delay processing with the use of the memory 14M in response to control signals sent from the control unit 18.
  • the signal processing unit 14 corrects at least one of the phase and the level of the acoustic signals in such a manner as will be described later.
  • the digital acoustic signals of the left- and right-channels outputted from the signal processing unit 14 are converted into analog acoustic signals respectively by digital/analog converters DADL, DADR.
  • the resultant analog acoustic signals are then outputted to the loudspeakers SL, SR through power amplifiers AMPL, AMPR corresponding to the respective digital/analog converters DADL, DADR, thereby to be released as sounds.
  • FIG. 3 is a functional block diagram for explaining signal processing operations in the signal processing unit 14.
  • the signal processing unit 14 comprises signal processing blocks including sound image control units U1 to U3, filter units F4L, F4R; FSL, FSR, delay units T4L, T4R; TSL, TSR, buffers BL, BR, and adder units ML, MR.
  • transmission characteristics of sounds vary according to the frequency bands thereof. For this reason, in order to equalize the phases of all frequency bands heard in the vicinity of the entrance of the external auditory channel of listeners 3a, 4 a at the driver's seat 3 and the passenger's seat 4, the acoustic signals are divided for each predetermined frequency band, and then corrected in the sound image control units U1 to U3.
  • the left-channel acoustic signal inputted to the sound image control unit U1 is inputted to a bandpass filter unit (hereinafter referred to as BPF) F1L, in which signal components are filtered of the acoustic signal lying in a frequency band f1 to be subjected by the sound image control unit U1, for example, signal components of 200 to 400 Hz.
  • BPF bandpass filter unit
  • An output of the BPF F1L is inputted to a crosstalk generating unit C1 to be described later.
  • the right-channel acoustic signal has signal components thereof lying in a frequency band f1 filtered in a BPF F1R, and then inputted to the crosstalk generating unit C1.
  • the left-channel acoustic signal is inputted to the crosstalk generating unit C2 after its signal components lying in a frequency ba d f2, e.g., those of 400 to 800 Hz, are filtered in a BPF F2L.
  • the right-channel acoustic signal is inputted to the crosstalk generating unit C2 through a BPF F2R.
  • the left-channel acoustic signal of left-channel is inputted to the crosstalk generating unit C3 after its signal components lying in a frequency band f3, e.g., those of 800 to 1600 Hz, are filtered in a BPF F3L.
  • the acoustic signal of the right-channel is inputted to the crosstalk generating unit C3 through a BPF F3R.
  • a part of the left-channel acoustic signal sent from the analog/digital converter ADDL is inputted through the high pass filter unit (hereinafter referred to as HPF) F4L or the low pass filter unit (hereinafter referred to as LPF) F5L to the delay units T4L, T5L respectively to be delayed by predetermined delay time t4L, t5L. Thereafter, the delayed signals are inputted to the adder unit ML. Further, a part of the left-channel acoustic signal of the entire frequency band is inputted to the adder unit MR as a crosstalk adjustment signal after being multiplied by a gain gL in the buffer BL.
  • HPF high pass filter unit
  • LPF low pass filter unit
  • a part of the right-channel acoustic signal sent from the analog/digital converter ADDR is inputted through the HPF F4R, or LPF L5R to the delay units T4R, T5R to be delayed by predetermined delay time t4R, t5R. Subsequently, the delayed signals are inputted to the adder unit MR. Further, a part of the right-channel acoustic signal of the entire frequency band is inputted to the adder unit ML as a crosstalk adjustment signal after being multiplied by a gain gR in the buffer BR.
  • a cut-off frequency f4 of the HPF F4L, F4R is selected to, for example, 1600 Hz, and a cut-off frequency f5 of the LPF F5L.
  • F5R is selected to for example 200 Hz.
  • FIG. 4 is a functional block diagram for explaining in detail the crosstalk generating unit C1.
  • a part of the output of the BPF F1L is inputted through an attenuator unit AL and a phase unit PL to an adder unit M1 as a crosstalk signal to be added to output from the BPF FIR.
  • Outputs of the adder unit M1 are delayed by a predetermined delay time tR in a delay unit TR, and then outputted to the adder unit MR.
  • a part of output of the BPF F1R is inputted through an attenuator unit AR and a phase unit PR to the an adder unit M2 as a crosstalk signal to be added to output from the BPF F1L.
  • the output of the adder unit M2 is delayed by a predetermined delay time tL in a delay unit TL, and then outputted to the adder unit ML.
  • the phase units PL, PR correct the phase of the acoustic signal inputted thereto by ⁇ L, ⁇ R respectively.
  • the attenuator units AL. AR attenuate the acoustic signal inputted thereto using attenuation factors aL, aR respectively. Constants, such as the phase correction amounts ⁇ L, ⁇ R and attenuation factors aL, aR, for digital signal processing are set by the control unit 18 in response to inputs from the input unit 17.
  • the remaining crosstalk generating units C2, C3 have a construction similar to the crosstalk generating unit C1 except that phase correction amounts ⁇ L, ⁇ R in the phase units PL, PR and attenuation factors aL, aR in the attenuator units AL, AR are set to values which vary in the respective frequency bands f1, f2, f3 in correspondence with acoustic characteristics of the compartment 2 in this embodiment.
  • FIG. 5 is a plan view for explaining functions of the sound image control units U1 to U3, and buffers BL, BR.
  • the loudspeaker SR is disposed to the right at an angle ⁇ 11 with respect to the frontward direction of the listener 3a seating in the driver's seat 3.
  • the loudspeaker SL is disposed to the left at an angle ⁇ 13 greater than the angle ⁇ 11 with respect to the frontward direction of the listener 3a.
  • the listener 3a perceives that source of the sound lies in a direction indicated by reference character l1.
  • the listener 3a perceives that the source of the sounds lies in a substantially frontward direction thereof indicated by reference character l2 in FIG. 5(2).
  • the listener 3a can perceive that the source of the right-channel sound lies in a direction outward of the loudspeaker SR as indicated by the reference character l3 in FIG. 5(3), instead of the previously perceived direction l2 which is inward of the loudspeaker SR.
  • a laterally symmetrical sound field can be formed such that the direction of sound image localization corresponds to the frontward direction of the listener 3a as indicated by reference character l4 and the sound field has an angle of divergence ⁇ 1 with respect to the frontward direction as indicated by reference characters l6, l7 as shown in FIG. 5(4).
  • the phase correction amounts ⁇ L, ⁇ R are adjusted so as to make the angle of divergence ⁇ 1 relatively large.
  • the gains gL, gR of the buffers BL. BR are adjusted to narrow the angle of divergence ⁇ 1. More specifically, the angle of divergence ⁇ 1 is narrowed by adjusting the level of the crosstalk adjustment signal; a signal to which the signal processing as described above is not applied.
  • an ideal sound field as indicated by reference character JR in FIG. 6 can be obtained which has an ankle of divergence ⁇ 3, for example about 30 degrees.
  • an ideal sound field can be formed which is laterally symmetrical with respect to the driver's seat 3 as shown by reference character JR and has an ideal angle of divergence ⁇ 3, and thereby the sound image can be localized in the frontward direction of the listener 3a without deviation.
  • the angle of divergence ⁇ 3 can be adjusted by only effecting an easy operation of adjusting the gains gL, gR of the buffers BL, BR without changing parameters within the crosstalk generating unit C1 to C3, such as the phase correction amounts ⁇ L, ⁇ R. This contributes to a remarkable improvement in operability of the acoustic reproducing apparatus, and thereby reducing an adverse influence on the driving operation of the automotive vehicle.
  • the acoustic signal of entire frequency bands from the acoustic signal source 11 is inputted to the buffers BL, BR.
  • filters F6L, F6R it may be appropriate to provide filters F6L, F6R to narrow the angle of divergence of the acoustic signals lying in a specific frequency band as in an acoustic signal processing unit 141 shown in FIG. 7 as another embodiment of the invention.
  • LPFs of 3 kHz whose cut-off frequency is set at an upper limit of a frequency band of human voice may be used as filters F6L, F6R.
  • the vocal sound is made to form the sound field JR having the angle of divergence ⁇ 3, and the sound image of the vocal sound can be localized in the frontward direction of the listener 3a without deviation.
  • the remaining acoustic components produced by musical instruments or the like may be made to form the sound field JRb having the angle of divergence ⁇ 1.
  • a wider sound field can be formed than the sound field of the vocal sound.
  • FIG. 8 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 1b representing still another embodiment of the invention
  • FIG. 9 is a functional block diagram for explaining signal processing operations in a signal processing unit 14b
  • FIG. 10 is a functional block diagram for explaining in detail a crosstalk generating unit C1b.
  • the embodiment is similar to the foregoing one, and therefore same or corresponding parts are indicated by like reference characters.
  • a center loudspeaker SC is provided between the left loudspeaker SL and the right loudspeaker SR in an instrument panel 5 in this embodiment. Accordingly, a power amplifier AMPC and a digital/analog converter DADC are provided in correspondence with the center loudspeaker SC.
  • the signal processing unit 14b outputs acoustic signals of three channels, i.e., the left-, right-, and center-channels. The acoustic signal of the center-channel is fed to the center loudspeaker SC through the digital/analog converter DADC and the power amplifier AMPC.
  • the crosstalk generating unit C1b of a sound image control unit U1b provided in the signal processing unit 14b is constructed as shown in FIG. 10.
  • outputs of BPFs F1L, F1R are inputted to an adder unit M3 through phase units PLb, PRb and attenuator units ALb, ARb respectively.
  • the acoustic signals of the left- and right-channels are added in an adder unit M4 in the crosstalk generating unit C1b.
  • the added signal is inputted to the adder unit M3 after being attenuated by an attenuation factor aC in an attenuator unit AC.
  • the output of the adder unit M3 is corrected in a phase unit PC by a phase correction amount ⁇ , and then outputted to an adder unit MC as a crosstalk signal.
  • the adder unit MC Further, to the adder unit MC are inputted the crosstalk adjustment signals from the buffers BL, BR. The added output of the adder unit MC is fed to the digital/analog converter DADC.
  • phase correction factors ⁇ Lb, ⁇ Rb, ⁇ in the phase units PLb, PRb, PC and attenuation factors aLb, aRb, aC in the attenuators ALb, ARb, AC are, in this embodiment, set to values which vary in the respective frequency bands f1, f2, f3 in correspondence with acoustic characteristics of the vehicle compartment 2.
  • FIG. 11 is a plan view for explaining functions of sound image control units U1b to U3b, and buffers BL, BR.
  • the right loudspeaker SR is disposed to the right at an ankle ⁇ 11 with respect to the frontward direction of the listener 3a seating in the driver's seat 9.
  • the center loudspeaker SC is disposed to the left at an angle ⁇ 12 greater than the angle ⁇ 11 with respect to the frontward direction of the listener 3a.
  • the left loudspeaker SL is disposed further to the left at an angle ⁇ 13 greater than the angle ⁇ 12 with respect to the frontward direction of the listener 3a.
  • the listener 3a perceives that the source of the sounds lies in a substantially frontward direction thereof indicated by reference character l2 in FIG. (2).
  • the listener 3a can perceive that the source of the right-channel sound lies in a direction outward of the loudspeaker SR as indicated by the reference character l3 in FIG. 11(3), instead of the previously perceived direction l2. which is inward of the loudspeaker SR.
  • the acoustic energy can be distributed laterally symmetrically by correcting the phase of the acoustic signal by the amount ⁇ in the phase units PC. Accordingly, or laterally symmetrical sound field can be formed such that the sound image is localized in the frontward direction of the listener 3a as indicated by reference character l4 and the sound field has the angle of divergence ⁇ 1 with respect to the frontward direction as indicated by reference character l6, l7 in FIG. 11(4).
  • phase correction amounts ⁇ Lb, ⁇ Rb, ⁇ are adjusted so as to make the angle of divergence ⁇ 1 relatively large.
  • the gains gL, gR of the buffers BL, BR are adjusted to narrow the angle of divergence ⁇ 1. More specifically., the angle of divergence ⁇ 1 is narrowed by adjusting the level of the crosstalk adjustment signal; a signal to which the signal processing as described above is not plied.
  • a sound field having an ideal angle of divergence ⁇ 3 and indicated by reference character JL can be formed with respect to the listener 4 a in the passenger's seat 4.
  • the sound fields are formed as indicated by reference characters JR, JL which are laterally symmetrical and have an ideal angle of divergence ⁇ 3 with respect to the driver's seat 3 and the assistant's seat 4, and thereby the sound image can be localized in the frontward direction of the listeners 3a, 4 a without deviation.
  • the angle of divergence ⁇ 3 can be adjusted only by effecting an easy operation of adjusting the gains EL, gR of the buffers BL, BR without changing parameters within the crosstalk generating unit C1b to C3b, such as the phase correction amounts ⁇ Lb, ⁇ Rb, ⁇ .
  • the acoustic signal of entire frequency bands from the acoustic signal source 11 is inputted to the buffers BL, BR.
  • filters F6L. F6R as described above to narrow the angle of divergence of the acoustic signals lying in a specific frequency band as in an acoustic signal processing unit 14c shown in FIG. 13 as still another embodiment of the invention.
  • FIG. 14 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 10 representing still another embodiment according to the invention.
  • This embodiment is similar to the foregoing embodiments, and therefore same or corresponding parts are indicated by like reference characters.
  • the acoustic signals from a sound signal source 11 are inputted to the signal processing unit 14 as acoustic signals of fundamental sounds.
  • a signal processing unit 15 which may be a digital signal processor or the like, generates effective sounds such as initial reflection sounds and reverberation sounds in such a manner to be described below.
  • Acoustic signals of the effective sounds are processed in a signal processing unit 16 having a construction similar to the signal processing unit 14, and then converted into acoustic vibrations together with those of the fundamental sounds sent from the signal processing unit 14.
  • the acoustic signals of fundamental sounds of left- and right-channels from the acoustic signal source 11 are converted into digital acoustic signals in analog/digital converters ADRL, ADRR respectively, and then inputted to the signal processing unit 15.
  • the signal processing unit 15 serving as means for generating the effective sounds processes the acoustic signals of fundamental sounds of the left- and right-channels inputted thereto so as to generate the acoustic signals of effective sounds of these channels, and outputs the resultant acoustic signals to the signal processing unit 16.
  • the digital acoustic signals of the left- and right-channels outputted from the signal processing unit 18 are converted into analog acoustic signals in digital/analog converters DARL, DARR, and then outputted to adder units 19L, 19R respectively.
  • the analog acoustic signals of the left- and right-channels from the digital/analog converters DARL, DARR are added to the corresponding acoustic signals of fundamental sounds of the left- and right-channels from the signal processing unit 14 in the adder units 19L, 19R respectively. Thereafter, the added acoustic signals of the left- and right-channels are respectively inputted to the power amplifiers AMPL, AMPR.
  • the signal processing units 18, 16 are provided with individual corresponding memories 15M, 16M, individually respectively, similar to the signal processing unit 14. These signal processing units 15, 16 execute arithmetic processings with the use of the memories 15M, 16M in response to control signals from the control unit 18.
  • FIG. 16 is a functional block diagram of the signal processing unit 15.
  • the acoustic signals of fundamental sounds of the left- and right-channels from the analog/digital converters ADRL, ADRR are added to be monaural acoustic signals in an adder unit 21, and then inputted to an early delay unit 22.
  • the early delay unit 22 delays the monaural signals by a predetermined period of time T1 relative to the acoustic signals of fundamental sounds indicated by reference character SD in FIG. 16, and then outputs the same to delay memories DL, DR which are provided for the respective left- and right-channels.
  • the delay memory DL comprises a plurality of memory cells DL1, DL2, . . . , DLn.
  • Individual memory cells DL1 DLn delay the acoustic signals inputted thereto by predetermined periods of time ⁇ TL1, ⁇ TL2, . . . , ⁇ TLn.
  • Outputs of the respective memory cells DL1 to DL(n-1) are sent to the memory cells DL2 to DLn provided at next stages. Further, the outputs of the respective memory cells DL1 to DLn are sent through coefficient units QL1 to QLn to an adder unit 23 to be added therein.
  • the coefficient units QL1 to QLn multiply the outputs from the corresponding memory cells DL1 to DLn by predetermined coefficients qL1 to qLn, and output the resultant signals to the adder unit 23.
  • a delay memory DR has a construction similar delay memory DL. In the delay memory DR, however, delay periods of the respective memory cells DR1 to DRn are selected to ⁇ TR1 to ⁇ TRn, and the coefficients in the respective coefficient units QR1 to QRn are selected to qR1 to qRn. Outputs of the respective coefficient units QR1 to QRn are sent to an adder unit 24 to be added therein.
  • the early delay unit 22 delays the monaural acoustic signal of fundamental sounds inputted thereto by a predetermined period of time T2, and then outputs the delayed signals to an adder unit 25.
  • the output of the adder unit 25 is delayed in a delay memory 28 by a predetermined period of time ⁇ Ta, which is relatively short, and then outputted to a line 28.
  • the output of the delay memory 26 is multiplied by a coefficient qa in a coefficient unit 27, and fed back to the adder unit 25.
  • the output of the delay memory 26 is sent through the line 28 to an adder unit 29 to be added to the output from the adder unit 23, and then fed to the signal processing unit 18 as an acoustic signal of effective sounds of the left-channel.
  • the output of the delay memory 26 is also sent to a delay memory 30 to be delayed by a predetermined period of time ⁇ Tb therein, and then sent to an adder unit 31.
  • the delayed output is added to the output from the adder unit 24, and consequently fed to the signal processing unit 16 as an acoustic signal of effective sounds of the right-channel.
  • a first initial reflection sound indicated by reference character SL1 is formed from a fundamental sound indicated by reference character SD after a period ⁇ T1+ ⁇ TL1.
  • initial reflection sounds SL2, SL3, . . . , SLn are respectively formed in succession after periods ⁇ TL2, ⁇ TL3, . . . , ⁇ TLn.
  • the levels of the reflection sounds SL1 to SLn are determined by the coefficients qL1 to qLn respectively.
  • the respective reflection sounds SL1 to SLn correspond to a plurality of reflection paths of sounds reflected from surfaces, such as ceiling, walls, and floor, which define an acoustic space.
  • the time periods T1. T2: ⁇ TL1 to ⁇ TLn: ⁇ TR1 to ⁇ TRn: ⁇ Ta, ⁇ Tb, and the coefficients QL1 to qLn qR1 to qRn: qa are, similar to the phase correction amount ⁇ L, ⁇ R and attenuation factors aL, aR, set by the control unit 18 in response to the inputs from the input unit 17. By changing such constants for digital signal processing, it is possible to simulate acoustic characteristics of a concert hall or baseball stadium.
  • the gains gL, gR of the buffers BL, BR are made larger, compared to those in the signal processing unit 16, in the control units U1 to U3 of the signal processing unit 14 to enhance the level of the crosstalk adjustment signal, there will be formed a sound field for fundamental sounds as indicated by reference character JR in which the sound image is stably localized in the frontward direction of the listener and which is laterally symmetrical.
  • reference character JR the sound field for fundamental sounds and the sound field JRb for effective sounds individually in this way, the sound image can be localized in the frontward direction of the listener and sounds can be reproduced with full presence.
  • FIG. 17 is a block diagram showing an electric construction of an automotive acoustic reproducing apparatus 10b representing another embodiment of the invention.
  • This embodiment is similar to the foregoing embodiments shown in FIGS. 8 and 14, and therefore same or corresponding parts are indicated by like reference characters.
  • What should be of notice is that fundamental sounds and effective sounds are released from a center loudspeaker in this embodiment. Accordingly, a digital acoustic signal of fundamental sounds of the center-channel from the signal processing unit 14b is converted into analog acoustic signals in a digital/analog converter DADC, and then inputted to an adder unit 19C.
  • DADC digital/analog converter
  • a digital acoustic signal of effective sounds of the center-channel from a signal processing unit 16b is converted into analog acoustic signals in a digital/analog converter DARC, and then inputted to the adder unit 19C.
  • the acoustic signal from the adder unit 19C is amplified in a power amplifier AMPC, and then fed to the center loudspeaker Therefore, in the case where the gains gL, gR of buffers BL, BE are made smaller in the signal processing unit 16b to reduce the level of the crosstalk adjustment signal, there will be formed relatively wide sound fields for effective sounds with respect to listeners as indicated by reference characters JLb, JRb in FIG. 12.
  • Correction for a laterally asymmetric sound field and control for expanding the sound field as described above are not limited to use in an automotive acoustic reproducing apparatus, but can be suitably applied to a television receiver in which loudspeakers of left- and right-channels are narrowly spaced.
  • signal processing for the laterally asymmetric sound field correction and the sound field expansion control may be executed in the receiver.
  • the signal processing may be executed at a broadcasting station, so that the processed acoustic signals are transmitted to the individual receivers.
  • acoustic signals of fundamental sounds from the signal processing unit 14 or 14b and acoustic signals of effective sounds from the signal processing unit 16 or 16b may be converted into analog acoustic signals after being added to each other in the form of digital signals.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
US08/188,738 1990-11-01 1994-01-31 Apparatus for expanding and controlling sound fields Expired - Fee Related US5710818A (en)

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JP11581490U JPH0472800U (de) 1990-11-01 1990-11-01
JP11581390U JPH0472799U (de) 1990-11-01 1990-11-01
JP2305707A JPH0834653B2 (ja) 1990-11-08 1990-11-08 音場拡大制御装置
JP2-305707 1990-11-08
US78684791A 1991-11-01 1991-11-01
US08/188,738 US5710818A (en) 1990-11-01 1994-01-31 Apparatus for expanding and controlling sound fields

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5854847A (en) * 1997-02-06 1998-12-29 Pioneer Electronic Corp. Speaker system for use in an automobile vehicle
US5999630A (en) * 1994-11-15 1999-12-07 Yamaha Corporation Sound image and sound field controlling device
US6222930B1 (en) * 1997-02-06 2001-04-24 Sony Corporation Method of reproducing sound
US6477255B1 (en) * 1998-08-05 2002-11-05 Pioneer Electronic Corporation Audio system
US6501843B2 (en) * 2000-09-14 2002-12-31 Sony Corporation Automotive audio reproducing apparatus
US6584202B1 (en) * 1997-09-09 2003-06-24 Robert Bosch Gmbh Method and device for reproducing a stereophonic audiosignal
US20040107116A1 (en) * 1992-11-17 2004-06-03 Health Hero Network, Inc. Networked health information system for monitoring food intake
US20040120536A1 (en) * 2002-12-23 2004-06-24 Lear Corporation Headliner transducer covers
US20040199409A1 (en) * 1992-11-17 2004-10-07 Brown Stephen J. Remote health monitoring and maintenance system
US20040247132A1 (en) * 1995-07-28 2004-12-09 Klayman Arnold I. Acoustic correction apparatus
US6876748B1 (en) * 1999-10-25 2005-04-05 Harman International Industries, Incorporated Digital signal processing for symmetrical stereophonic imaging in automobiles
US20050273509A1 (en) * 1997-03-28 2005-12-08 Health Hero Network, Inc. Networked system for interactive communication and remote monitoring of individuals
US20060034467A1 (en) * 1999-08-25 2006-02-16 Lear Corporation Vehicular audio system including a headliner speaker, electromagnetic transducer assembly for use therein and computer system programmed with a graphic software control for changing the audio system's signal level and delay
US7050593B1 (en) * 1999-08-25 2006-05-23 Lear Corporation Vehicular audio system and electromagnetic transducer assembly for use therein
US20060189853A1 (en) * 1992-11-17 2006-08-24 Health Hero Network, Inc. Method and system for improving adherence with a diet program or other medical regimen
US20060285736A1 (en) * 1992-11-17 2006-12-21 Health Hero Network, Inc. Multi-user remote health monitoring system with biometrics support
US20070094049A1 (en) * 1992-11-17 2007-04-26 Brown Stephen J Method and apparatus for remote health monitoring and providing health related information
WO2007106551A1 (en) * 2006-03-15 2007-09-20 Dolby Laboratories Licensing Corporation Stereophonic sound imaging
US20070253574A1 (en) * 2006-04-28 2007-11-01 Soulodre Gilbert Arthur J Method and apparatus for selectively extracting components of an input signal
US20070299321A1 (en) * 1992-11-17 2007-12-27 Brown Stephen J Method and apparatus for remote health monitoring and providing health related information
US20080069366A1 (en) * 2006-09-20 2008-03-20 Gilbert Arthur Joseph Soulodre Method and apparatus for extracting and changing the reveberant content of an input signal
US20080080720A1 (en) * 2003-06-30 2008-04-03 Jacob Kenneth D System and method for intelligent equalization
US20110033070A1 (en) * 2006-10-25 2011-02-10 Pioneer Corporation Sound image localization processing apparatus and others
US20110081024A1 (en) * 2009-10-05 2011-04-07 Harman International Industries, Incorporated System for spatial extraction of audio signals
US8379874B1 (en) * 2007-02-02 2013-02-19 Jeffrey Franklin Simon Apparatus and method for time aligning program and video data with natural sound at locations distant from the program source and/or ticketing and authorizing receiving, reproduction and controlling of program transmissions
US9088842B2 (en) 2013-03-13 2015-07-21 Bose Corporation Grille for electroacoustic transducer
US9327628B2 (en) 2013-05-31 2016-05-03 Bose Corporation Automobile headrest
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Citations (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170991A (en) * 1963-11-27 1965-02-23 Glasgal Ralph System for stereo separation ratio control, elimination of cross-talk and the like
JPS4914104A (de) * 1972-05-16 1974-02-07
US4121059A (en) * 1975-04-17 1978-10-17 Nippon Hoso Kyokai Sound field expanding device
JPS53139501A (en) * 1977-05-11 1978-12-05 Matsushita Electric Ind Co Ltd Reverberation adding system in stereo transmission
JPS5412702A (en) * 1977-06-29 1979-01-30 Nippon Hoso Kyokai <Nhk> Stereo sound field variable apparatus
US4149036A (en) * 1976-05-19 1979-04-10 Nippon Columbia Kabushikikaisha Crosstalk compensating circuit
US4329544A (en) * 1979-05-18 1982-05-11 Matsushita Electric Industrial Co., Ltd. Sound reproduction system for motor vehicle
JPS5841720A (ja) * 1981-09-02 1983-03-11 Nippon Soda Co Ltd 金属酸化被膜形成組成物
JPS591040A (ja) * 1982-06-25 1984-01-06 Kobe Steel Ltd 円柱状部材の油溝加工方法
EP0160431A2 (de) * 1984-04-09 1985-11-06 Pioneer Electronic Corporation Schallfeldverbesserungssystem
US4622691A (en) * 1984-05-31 1986-11-11 Pioneer Electronic Corporation Mobile sound field correcting device
JPS61257099A (ja) * 1985-05-10 1986-11-14 Nippon Gakki Seizo Kk 音響制御装置
EP0276948A2 (de) * 1987-01-27 1988-08-03 Yamaha Corporation Schallfeld Steuerungsanlage
JPS6440560A (en) * 1987-08-07 1989-02-10 Oji Paper Co Chemically modified wood-synthetic polymer composition
US4866776A (en) * 1983-11-16 1989-09-12 Nissan Motor Company Limited Audio speaker system for automotive vehicle
EP0357034A2 (de) * 1988-08-30 1990-03-07 Nec Corporation Audioverarbeitungssystem für Balancesteuerung der Amplitude und Phase eines Audiosignals
JPH02161900A (ja) * 1988-09-21 1990-06-21 Hitachi Ltd 車載用音響機器
US4953219A (en) * 1987-06-26 1990-08-28 Nissan Motor Company Limited Stereo signal reproducing system using reverb unit
JPH02261300A (ja) * 1989-03-31 1990-10-24 Toshiba Corp 立体音再生装置
EP0422955A2 (de) * 1989-10-12 1991-04-17 Matsushita Electric Industrial Co., Ltd. Schallfeld-Steuerungssystem
US5040220A (en) * 1986-09-30 1991-08-13 Yamaha Corporation Control circuit for controlling reproduced tone characteristics
US5040219A (en) * 1988-11-05 1991-08-13 Mitsubishi Denki Kabushiki Kaisha Sound reproducing apparatus
US5068897A (en) * 1989-04-26 1991-11-26 Fujitsu Ten Limited Mobile acoustic reproducing apparatus
JPH0472800A (ja) * 1990-07-13 1992-03-06 Canon Inc リード線挿入検査装置
JPH0472799A (ja) * 1990-07-13 1992-03-06 Canon Inc 電子部品供給装置
US5129004A (en) * 1984-11-12 1992-07-07 Nissan Motor Company, Limited Automotive multi-speaker audio system with different timing reproduction of audio sound

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170991A (en) * 1963-11-27 1965-02-23 Glasgal Ralph System for stereo separation ratio control, elimination of cross-talk and the like
JPS4914104A (de) * 1972-05-16 1974-02-07
US4121059A (en) * 1975-04-17 1978-10-17 Nippon Hoso Kyokai Sound field expanding device
US4149036A (en) * 1976-05-19 1979-04-10 Nippon Columbia Kabushikikaisha Crosstalk compensating circuit
JPS53139501A (en) * 1977-05-11 1978-12-05 Matsushita Electric Ind Co Ltd Reverberation adding system in stereo transmission
JPS5412702A (en) * 1977-06-29 1979-01-30 Nippon Hoso Kyokai <Nhk> Stereo sound field variable apparatus
US4329544A (en) * 1979-05-18 1982-05-11 Matsushita Electric Industrial Co., Ltd. Sound reproduction system for motor vehicle
JPS5841720A (ja) * 1981-09-02 1983-03-11 Nippon Soda Co Ltd 金属酸化被膜形成組成物
JPS591040A (ja) * 1982-06-25 1984-01-06 Kobe Steel Ltd 円柱状部材の油溝加工方法
US4866776A (en) * 1983-11-16 1989-09-12 Nissan Motor Company Limited Audio speaker system for automotive vehicle
EP0160431A2 (de) * 1984-04-09 1985-11-06 Pioneer Electronic Corporation Schallfeldverbesserungssystem
US4980914A (en) * 1984-04-09 1990-12-25 Pioneer Electronic Corporation Sound field correction system
US4622691A (en) * 1984-05-31 1986-11-11 Pioneer Electronic Corporation Mobile sound field correcting device
US5129004A (en) * 1984-11-12 1992-07-07 Nissan Motor Company, Limited Automotive multi-speaker audio system with different timing reproduction of audio sound
JPS61257099A (ja) * 1985-05-10 1986-11-14 Nippon Gakki Seizo Kk 音響制御装置
US5040220A (en) * 1986-09-30 1991-08-13 Yamaha Corporation Control circuit for controlling reproduced tone characteristics
EP0276948A2 (de) * 1987-01-27 1988-08-03 Yamaha Corporation Schallfeld Steuerungsanlage
US4953219A (en) * 1987-06-26 1990-08-28 Nissan Motor Company Limited Stereo signal reproducing system using reverb unit
JPS6440560A (en) * 1987-08-07 1989-02-10 Oji Paper Co Chemically modified wood-synthetic polymer composition
EP0357034A2 (de) * 1988-08-30 1990-03-07 Nec Corporation Audioverarbeitungssystem für Balancesteuerung der Amplitude und Phase eines Audiosignals
US5109415A (en) * 1988-08-30 1992-04-28 Nec Corporation Audio signal processing system performing balance control in both amplitude and phase of audio signal
JPH02161900A (ja) * 1988-09-21 1990-06-21 Hitachi Ltd 車載用音響機器
US5040219A (en) * 1988-11-05 1991-08-13 Mitsubishi Denki Kabushiki Kaisha Sound reproducing apparatus
JPH02261300A (ja) * 1989-03-31 1990-10-24 Toshiba Corp 立体音再生装置
US5068897A (en) * 1989-04-26 1991-11-26 Fujitsu Ten Limited Mobile acoustic reproducing apparatus
EP0422955A2 (de) * 1989-10-12 1991-04-17 Matsushita Electric Industrial Co., Ltd. Schallfeld-Steuerungssystem
JPH0472800A (ja) * 1990-07-13 1992-03-06 Canon Inc リード線挿入検査装置
JPH0472799A (ja) * 1990-07-13 1992-03-06 Canon Inc 電子部品供給装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Hans Jaochim HAASE, Manipulationen zwischen Weidergabakan a len , Funk Technik , 1986, magazine 12, pp. 526 530. *
Hans-Jaochim HAASE, `Manipulationen zwischen Weidergabakanalen`, Funk-Technik, 1986, magazine 12, pp. 526-530.

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US8015030B2 (en) 1992-11-17 2011-09-06 Health Hero Network, Inc. User-based health monitoring
US7979284B2 (en) 1992-11-17 2011-07-12 Health Hero Network, Inc. Interactive video based remote health monitoring system
US8419636B2 (en) 1992-11-17 2013-04-16 Robert Bosch Healthcare Systems, Inc. Method and system for improving adherence with a diet program or other medical regimen
US8024201B2 (en) 1992-11-17 2011-09-20 Health Hero Network, Inc. Method and apparatus for remote health monitoring and providing health related information
US8015025B2 (en) 1992-11-17 2011-09-06 Health Hero Network, Inc. Method and apparatus for remote health monitoring and providing health related information
US7941323B2 (en) 1992-11-17 2011-05-10 Health Hero Network, Inc. Remote health monitoring and maintenance system
US20040107116A1 (en) * 1992-11-17 2004-06-03 Health Hero Network, Inc. Networked health information system for monitoring food intake
US7853455B2 (en) 1992-11-17 2010-12-14 Health Hero Network, Inc. Remote health monitoring and maintenance system
US20040199409A1 (en) * 1992-11-17 2004-10-07 Brown Stephen J. Remote health monitoring and maintenance system
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US20100152552A1 (en) * 1992-11-17 2010-06-17 Brown Stephen J User-based health monitoring
US7689440B2 (en) 1992-11-17 2010-03-30 Health Hero Network, Inc. Method and apparatus for remote health monitoring and providing health related information
US20070299321A1 (en) * 1992-11-17 2007-12-27 Brown Stephen J Method and apparatus for remote health monitoring and providing health related information
US20070118404A1 (en) * 1992-11-17 2007-05-24 Brown Stephen J Method and apparatus for remote health monitoring and providing health related information
US20070094049A1 (en) * 1992-11-17 2007-04-26 Brown Stephen J Method and apparatus for remote health monitoring and providing health related information
US20060100910A1 (en) * 1992-11-17 2006-05-11 Health Hero Network, Inc. Interactive video based remote health monitoring system
US20060285736A1 (en) * 1992-11-17 2006-12-21 Health Hero Network, Inc. Multi-user remote health monitoring system with biometrics support
US20060189853A1 (en) * 1992-11-17 2006-08-24 Health Hero Network, Inc. Method and system for improving adherence with a diet program or other medical regimen
US5999630A (en) * 1994-11-15 1999-12-07 Yamaha Corporation Sound image and sound field controlling device
US7555130B2 (en) 1995-07-28 2009-06-30 Srs Labs, Inc. Acoustic correction apparatus
US7043031B2 (en) * 1995-07-28 2006-05-09 Srs Labs, Inc. Acoustic correction apparatus
US20040247132A1 (en) * 1995-07-28 2004-12-09 Klayman Arnold I. Acoustic correction apparatus
US20060062395A1 (en) * 1995-07-28 2006-03-23 Klayman Arnold I Acoustic correction apparatus
US5854847A (en) * 1997-02-06 1998-12-29 Pioneer Electronic Corp. Speaker system for use in an automobile vehicle
US6222930B1 (en) * 1997-02-06 2001-04-24 Sony Corporation Method of reproducing sound
US20070135688A1 (en) * 1997-03-28 2007-06-14 Brown Stephen J Networked system for interactive communication and remote monitoring of individuals
US7730177B2 (en) 1997-03-28 2010-06-01 Health Hero Network, Inc. Networked system for interactive communication and remote monitoring of individuals
US20060287931A1 (en) * 1997-03-28 2006-12-21 Health Hero Network, Inc. Networked system for interactive communication and remote monitoring of individuals
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US8870762B2 (en) 1997-03-28 2014-10-28 Robert Bosch Gmbh Electronic data capture in clinical and pharmaceutical trials
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US20070011320A1 (en) * 1997-03-28 2007-01-11 Health Hero Network, Inc. Networked system for interactive communication and remote monitoring of individuals
US6584202B1 (en) * 1997-09-09 2003-06-24 Robert Bosch Gmbh Method and device for reproducing a stereophonic audiosignal
US6477255B1 (en) * 1998-08-05 2002-11-05 Pioneer Electronic Corporation Audio system
US20060034467A1 (en) * 1999-08-25 2006-02-16 Lear Corporation Vehicular audio system including a headliner speaker, electromagnetic transducer assembly for use therein and computer system programmed with a graphic software control for changing the audio system's signal level and delay
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US7050593B1 (en) * 1999-08-25 2006-05-23 Lear Corporation Vehicular audio system and electromagnetic transducer assembly for use therein
US6876748B1 (en) * 1999-10-25 2005-04-05 Harman International Industries, Incorporated Digital signal processing for symmetrical stereophonic imaging in automobiles
US6501843B2 (en) * 2000-09-14 2002-12-31 Sony Corporation Automotive audio reproducing apparatus
US20040120536A1 (en) * 2002-12-23 2004-06-24 Lear Corporation Headliner transducer covers
US7218745B2 (en) 2002-12-23 2007-05-15 Lear Corporation Headliner transducer covers
US20080080720A1 (en) * 2003-06-30 2008-04-03 Jacob Kenneth D System and method for intelligent equalization
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US20110033070A1 (en) * 2006-10-25 2011-02-10 Pioneer Corporation Sound image localization processing apparatus and others
US8379874B1 (en) * 2007-02-02 2013-02-19 Jeffrey Franklin Simon Apparatus and method for time aligning program and video data with natural sound at locations distant from the program source and/or ticketing and authorizing receiving, reproduction and controlling of program transmissions
US20110081024A1 (en) * 2009-10-05 2011-04-07 Harman International Industries, Incorporated System for spatial extraction of audio signals
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US9088842B2 (en) 2013-03-13 2015-07-21 Bose Corporation Grille for electroacoustic transducer
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